Britain in turmoil, Cavaliers and Roundheads, Oliver Cromwell and the first Parliament! From a historians point of view this was a tremendously exciting period of British history however, from Charles Iâs view, a most traumatic reign ending up with his execution. During this period there were numerous Mints producing coinage including these King on horseback halfcrowns. These are the last hammered coins produced so they should be included in all collections. Coins are in good fine condition and are quite scarce.